软土地层加固对盾构姿态调控及地层变形的影响研究 |
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作者姓名: | 苏栋 谭毅俊 沈翔 黄昌富 陈湘生 |
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作者单位: | 1. 深圳大学土木与交通工程学院;2. 滨海城市韧性基础设施教育部重点实验室(深圳大学);3. 深圳市地铁地下车站绿色高效智能建造重点实验室;4. 中铁十五局集团有限公司 |
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基金项目: | 国家自然科学基金(52090081,51938008); |
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摘 要: | Based on the large-diameter shield tunnel project in soft soil strata in Hengqin District of Zhuhai City, this paper establishes a numerical simulation and analysis model for large-diameter shield tunnelling in unrein-forced and pre-reinforced strata, and investigates the relationship between the deflection moment and pitch angle of the shield machine as well as the impact of the changes in the machine′s attitude on the deformation of the strata by changing the load distribution of the thrust system to apply the deflection moment. The results show that the gravitational eccentric moment that causes the initial "bow" of the shield machine is 261 MN·m, and the deflection moment required to level the attitude under the condition of pre-reinforced strata is about 21 MN·m, which is 81.1% smaller than the condition of un-reinforced strata (111 MN·m). Under the condition of pre-reinforced strata, for every 100 MN·m increase in the positive deflection moment, the pitch angle of the shield machine will increase by about 0.015°, which is 84.2% smaller than the condition of un-reinforcement (0.095°). Also, under the condition of identical negative deflection moment, the absolute value of pitch angle after pre-reinforcement is more than 85.0% smaller than the un-reinforced case. Pre-reinforcement of the strata results in a reduction of over 95.0% in both the maximum uplift and maximum settlement of the ground surface. © 2023 Editorial By Modern Tunnelling Technology. All rights reserved.
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关 键 词: | 软土地层 盾构姿态 偏转力矩 俯仰角 地层变形 |
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